1) First of all Download & Install Firefox 3.6.19. This version and Firefox 5.0.x are the only Stable and Still Maintained versions of Firefox. http://www.mozilla.com/en-US/firefox/all-older.html 2) Your UserAgent string in Firefox is messed up by another program that you installed. NET_mmhpset was added by some piece of Comcast software. http://en.wikipedia.org/wiki/User_Agent type '''about:config''' in the URL bar and hit Enter ''If you see the warning, you can confirm that you want to access that page.'' Filter = '''general.useragent.extra.firefox''' Right-click that preference and select '''Reset'''. Now Restart Firefox. 3) Your User Agent shows that you have the '''Ask Toolbar''' installed. The Ask Toolbar is causing many problems in Firefox versions. '''Uninstall''' that extension. There are a couple of places to check for the Ask toolbar: * Check the Windows Control Panel for the Ask Toolbar - http://about.ask.com/apn/toolbar/docs/default/faq/en/ff/index.html#na4 * Also check your list of extensions, you may be able to uninstall it from there - https://support.mozilla.com/kb/Uninstalling+add-ons * Restart Firefox Check and tell if its working.